Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0d94a3cb2f4f5b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 11:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17d278c5f5a80452cb1f222ae7077568 SHA-1: f37cceefc9cde07fbcff5f82af63860627d3ad04 SHA-256: dd0d94a3cb2f4f5b0219bfeec1a309c6c7a5dd9d936b232ef3d79ff7ec05957d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=net+rental+income+calculation+worksheet PDF link annotation
    • http://vallovin.it/userfiles/files/2477289819.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/nivowilidiwaxorum.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/at56s8eq11bh7lsc4fil4p0c9h/73478741241.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/80557420003.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c60cc1199cb---87933500765.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16107fd3804eea---suropofobaraxa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a8ebe891d---44580863832.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/ruwefinesupapu.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/dunidupevawezikawaluz.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/kuvovawifim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3738a1fd2---rodifefevironin.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/41641113010.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/34470304595.pdfIn PDF document text
    • http://alltechsro.cz/files/piwosez.pdfIn PDF document text
    • https://nada70.org/userfiles/file/97069752715.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/monaj.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/749ackghd9u22obucmonu0j5s3/ganijoviku.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/pa43vcb58esl210rufmakv23g1/53877856450.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4e5cc4bf91c2839eb7e5873a7b2ec670/bibofujuwodow.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d400c6ef4d3---majavitepezavok.pdfIn PDF document text
    • http://feast.to/upd_file/zarusu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17624 bytes
SHA-256: 52d6b2b08214f976254f07b0013d25ff45787e41ebe3d31bc04c0b6716191d1a
font_01_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 10752 bytes
SHA-256: 944ef926eb53543b2be1a6f612843e80a5e34541025bb7c3b75812d8126039c6
font_02_sfnt_off000128d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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